CARBOHYDRATES 



147 



Table 8-2. Patterns of oligosides of the Gramineae. 



Nevertheless, some genera which contain much raffinose do not form 

 stachyose. 



MacLeod and McCorquodale also compared hydrolysis prod- 

 ucts of the polysaccharides. These always yielded mostly glucose but 

 in addition, the pentoses, xylose and arabinose, were often present, 

 and the relative per cent of xylose and arabinose differed among the 

 genera. Finally, Nardus yielded 19 per cent mannose, and Molinia 

 yielded 23 per cent galactose. 



General appraisal by MacLeod and McCorquodale of the 

 taxonomic significance of their findings was as follows: 



(1) Nardus was distinctive in its high content of water- 

 soluble mannan. 



(2) The Hordeae formed a natural group, but on the basis of 

 its content of soluble polysaccharides Hordeum itself is 

 rather distinctive from the other genera examined. 



